Tubular heat-exchanging apparatus.



H. ZIMMERMANN. TUBULAR HEAT EXCHANGING APPARATUS.

APPLICATION FILED NOV. l2, I914.

Patented Jan. lb, 1916.

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INVENTOR Afi'oRNEY WITNESSEjM subject of the German Empire, residing in STATES PATENT OFFICE.

HANS ZIMMERMANN, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOB TO SGHUTTE 85 KOERTING COMPANY, OF PHILADELPHIA,. PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

I To all whom of may concern Be it known that I, HANS ZIMMERMANN, a

the city and county of Philadelphia, in the State of Pennsylvania, have invented certain new and useful Improvements in Tubular Heat-Exchanging Apparatus, of which the following is a true and exact description, reference being had to the accompanying drawings, which form a part thereof.

My present invention relates to tubular heat exchanging apparatus of what may be called the surface condenser type, and has for its object to provide the improvements hereinafter explained in the construction of a tubular element for use in such apparatus and in which the group of open or active tubes are rigidly connected at their ends into the tube sheets or partitions.

The various features of novelty which characterize my invention are pointed out with particularity in the claims annexed to and forming a part of this specification. For a better understanding of my invention however, and the advantages possessed by it, reference should be had to the accompanying drawings and descriptive matter in which I have illustrated and'described the apparatus embodying a preferred form of my invention.

Of the drawings: Figure 1 is a sectional elevation of an assembled tubular heat exchanging device. Fig. 2 is a section on the line 22 of Fig. 1. .Fig. 3 is an elevation partly broken away and partly in, section showing one of the baffle spacing devices and portions of the tube sheets and bafiies engaged thereby. Fig. 4 is a sectional elevation through the central dead tube and adiacent portions of the tube sheets and baflies.

The heat interchanging device shown in the drawings comprises a tubular casing A formed with inlet and outlet ports A and A respectively, adjacent its ends, and with inlet and outlet ports A and A, respectively, somewhat more remote from its ends. \Yithinthe casing are located a group of active tubes B which are rigidly connected at their ends to tube sheets or partitions C and C The latter serve as partitions to divide the interior of the casing A into two end chambers a and a connected by the tubes B and a central chamber traversed by the tubes. The fluid passing through the tubes Specification of Letters Patent.

TUBULAR HEAT-EXCHANGING APPARATUS.

PatentedJan. 18, 1916.

Application filed November 12, 1914. Serial No. 871,667.

B first enters the chamber a of the casing A, through the inlet port A and passes out of the casing A 'throughthe chamber a and the outlet port A. The fluid passing permitted axial movement relative to casing A to accommodate the thermal expansion of the tubes B relative to the casing.

The provisions, collectively indicated by the symbol M, for preventing leakage be.- tween chamber a and the central chamber through the joint between need not be described in detail herein as these provisions are disclosed in detail and claimed in my copending application, Serial No. 855,114. The device shown in the drawings While adapted for many uses, is specially devised for use as an oil cooler, the oil entering the apparatus through the port A and leaving through the port A while water for cooling the oil is admitted to the central chamber of the device through the port A and is discharged through the port A.

To cause the fluid entering and leaving the central chamber of the apparatus through the ports A and A respectively, to flow back and forth transversely of, as well as longitudinally of the tubes B, I employ alternately disposed battles E and F. The bafiies E are in the form of annuli or disks formed each with a large central aperture and each extending at its periphery into.

contact with the casing A'which, as shown, 7

is formed with internal ribs A the inner curved walls of which are engaged by the T as peripheral edges of the disksE. The al-1 ternate bailies F are in the form of disks: separated at their peripheral edges from the as the tubes B and which passes through apertures in the bafiies E and F, tubular spacing members H strung on the tube G and each spacing an adjacent pair of baffles E and F apart, andtubular spacers H surrounding the tube G and extending between the'tube sheets C and C and the adjacent bafiies. As shown, each tube G which is .rigidly connected at its ends to the tube verse cuts or slots, G in the tube G adjacent each end. This permits of a suflicient contraction and expansion of the tube G relative to the tubes B without subjecting the connections of any of the tubes to the tube sheet C to an undesirable strain. Similarly I form cuts H in one or more of the tubular spacing sections surrounding each tube G. As shown, these cuts are formed in each of the end pieces H The sealing of the ends of the tube G and of the tube sneet ends of the tube sections H is obviously necessary to prevent leakage with the cuts G and H formed in the walls as described. Even though there were as free a circulation between the chambers a and a through the tubes G, as through the tubes B, there would be a tendency to a relative expansion and contraction in length of the tubes G relative to the tubes B, owing to the fact that the temperature attained by the tubes G would be different from the temperature attained by the tubes B on account of the heat insulating efl'ect of the sections H and H which of course, would also tend to contract and expand relative to the tubes G.

As shown, the ends of the tubes G are filled by the reduced inner ends of plugs I. The outer ends of the plugs I, while larger in diameter than the internal diameter of the tubes G, are, as shown, smaller in diameter than the internal diameter of the tube sections H by which they are surrounded. The joints between the outer ends of the plugs I and tube sections H are brazed as indicated at J and by the metal out of which the corresponding tube sheets C and C are formed, if as may well be the case, these tube sheets are formed by metal cast about the ends of the tubes.

\Vith my improved baflie spacing construction described, it will be apparent that the baffles may be accurately spaced as desired and this is a matter of substantial practical importance especially in the case of apparatus designed for operation at high My novel expedient of making a closed or inactive tube readily variable in length to compensate for the tendency toward relative expansion and contraction in length between it and open active tubes which like the inactive tube, are anchoredat their ends in the tube sheets of apparatus of the kind under consideration, may be employed in connection with other inactive tubes than those forming a part of the baffle spacing means.

For instance, this expedient may be employed, as shown in the drawings, in the case of the inactive central tube K having h the transverse cuts K, has its ends closed by plugs L, shaped to serve as centering pieces by which the tubular element, as a whole, may be mounted in a lathe to enable the peripheral edges of the tube sheets C and C and the peripheral edges of the baflies F, if necessary, to be turned. It is not practically feasible to remove these centering pieces after the tubular element is machined. The tube K forms a convenient means for initially holding the centering pieces in position, while the tube sheets C and C are cast in place, and also serves as a dlsplaclng member to fill the otherwise existing and objectionable dead space in the center of the tubular element.

While in accordance with theprovisions of the statutes I have illustrated and described the best form of my invention, now

known to me, those skilled inthe art understand that changes may be made in the form of the apparatus disclosed herein without departing from the spirit of the invention covered by the claims and that under certain conditions, certain features of my invention may be used without the corresponding use of other features.

Having now described my invention, what I claim as new and desire to secure by Letters Patent, is: I

1. .In tubular heat interchanging apparatus, a tubular element comprising a set of open tubes and tube sheets to which the ends of said tubes are rigidly connected, and one or more closed tubes, each rigidly connected at its ends to said tube sheets and made readily expansible and contractile in length to compensate for the difi'erence in the thermal expansion and contraction of the closed tubes relative to the open tubes.

2. Thecombination in a tubular heat interchanging element comprising opentubes and tube sheets to which the ends of the tubes are rigidly connected and which are free to approach and separate from one another as said tubes contract and expand; and

one or more closed tubes each extendin between and rigidly connected at its en to said tube sheets and formed with transverse cuts to render it readily expansible and contractile in length.

3. In tubular heat interchanging apparatus, a combination with a set of open tubes and tube sheets to which the ends of said tubes are rigidly connected, of baflies extending transversely to said tubes through the inter tube space, and bafiie spacing means comprising one or more closed tubes, each rigidly connected at its ends to said tube sheets, and made expansible in length in comparison with said open tubes.

4. In tubular heat interchanging apparatus, a combination with a set of open tubes and tube sheets to which the ends of said tubes are rigidly connected, of baflles extending transversely to said tubes through the intertiibe space, and baflie spacing means comprising one or more closed tubes, each rigidly connected at its ends to said tube ;-sheets, and made expansible in length in comparison with said open tubes passing through apertures in said bafiles and a set of tubular spacing sections proper surrounding said closed tube, and interposed between adrigidly connected at its ends to said tube sheets, and made expansible in length in comparison with said open tubes passing through apertures in said baffles, and a set of tubular spacing sections proper surrounding said closed tube, and interposed between adjacent bafiles and between the tube sheets and adjacent baflies, one or more of said spacing sections being made readily expansible and contractile in length.

HANS ZIMMERMANN.

Witnesses:

D. W. HmoRE'rH, SIMON W. SNYDER. 

